package com.huanghuai.retail.controller;

import com.huanghuai.retail.common.CustomException;
import com.huanghuai.retail.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${upload.file.location}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws FileNotFoundException {
        if (file == null) {
            return R.error("失败");
        }

        log.info(file.toString());
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        log.info(originalFilename);

        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        
        log.info(suffix);
        //使用uuid重新生成文件名，防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;
        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()) {
            //目录不存在，需要创建
            dir.mkdirs();
        }
        try {
            File newFile = new File(dir.getAbsolutePath() + File.separator + fileName);
            file.transferTo(newFile);
//            file.transferTo(new File(base+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @PostMapping("/uploadFile")
    public R<String> uploadFile(MultipartFile file) throws FileNotFoundException {
        if (file == null) {
            return R.error("失败");
        }

        log.info(file.toString());
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        //???
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用uuid重新生成文件名，防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString()+"/";
//        创建一个目录对象
        File dir = new File(basePath+fileName);
        //判断当前目录是否存在
        if (!dir.exists()) {
            //目录不存在，需要创建
            dir.mkdirs();
        }
        try {
            File newFile = new File(dir.getAbsolutePath() + File.separator + originalFilename);
            file.transferTo(newFile);
        } catch (Exception e) {
            e.printStackTrace();
            throw new CustomException("文件错误");
        }
        System.out.println(fileName + originalFilename + " ===================================");
        return R.success(fileName+originalFilename);
    }

    @GetMapping("/download")
    public void download(String name ,HttpServletResponse response) {
        if (StringUtils.isNotBlank(name)) {
            try {
                System.out.println(name + "------------------------------------");
                //输入流，通过输入流读取文件内容
                FileInputStream fileInputStream = new FileInputStream(basePath + name);
                //输出流，通过输出流将文件写回浏览器，在浏览器展示图片了
                ServletOutputStream outputStream = response.getOutputStream();
                String suffix = name.substring(name.lastIndexOf("."));

                //识别各种文件后缀来设置ContentType
                switch (suffix) {
                    case ".jpg":
                    case ".png":
                    case ".gif":
                    case ".jpeg":
                        response.setContentType("image/jpeg");
                        break;
                    case ".doc":
                    case ".docx":
                        response.setContentType("application/msword");
                        break;
                    case ".xls":
                    case ".xlsx":
                        response.setContentType("application/vnd.ms-excel");
                        break;
                    case ".ppt":
                    case ".pptx":
                        response.setContentType("application/vnd.ms-powerpoint");
                        break;
                    case ".zip":
                    case ".rar":
                        response.setContentType("application/x-zip-compressed");
                        break;
                    case ".pdf":
                        response.setContentType("application/pdf");
                        break;
                    case ".txt":
                        response.setContentType("text/plain");
                        break;
                    case ".html":
                    case ".htm":
                        response.setContentType("text/html");
                        break;
                    case ".css":
                        response.setContentType("text/css");
                        break;
                    case ".js":
                        response.setContentType("text/javascript");
                        break;
                    default:
                        response.setContentType("application/octet-stream");
                        break;
                }
                int len = 0;
                byte[] bytes = new byte[1024];
                while ((len = fileInputStream.read(bytes)) != -1) {
                    outputStream.write(bytes, 0, len);
                    outputStream.flush();
                }
                //关闭资源
                outputStream.close();
                fileInputStream.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
